What is the difference between these two types of gas path control?
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This post was last edited by timwangwt on 2017-7-9 at 10:43. For air circuit control ball valves, I have seen two different types of such controls; could you please tell me what the differences between these two types are? What are the respective application scopes? Air path 1: Air path 2:
As can be seen from the diagram, the control principle is the same; the second air circuit includes an air circuit amplifier that is used in valves with larger actuation cylinders
Gas path amplification? Are you referring to the fact that if the air path passes directly through a solenoid valve, the flow rate of instrument air will be lower, while if it passes through an air-controlled directional valve, the flow rate of instrument air will be higher?
Figure 1 shows the emergency valve closure in case of a power outage, while Figure 2 shows it in case of a power and gas outage.
Gas path amplification? Don’t scare me – Figure 2 shows multi-level protection, with an additional gas-shutoff trip to prevent operation when the pressure is insufficient
The exhaust flow rate for the first interface is only 1/4, while it’s 1/2 for the second; thus the exhaust speed will be higher for the second one, though the principle remains the same
Figure 2 and Figure 1 achieve the same ultimate goal, but Figure 2 includes a air supply failure hold valve 14; when the air supply pressure is insufficient, the solenoid valve is unable to release air, thereby ensuring that the switch valve does not operate. This is also proven by the additional one-way valve 26.
Is there air suspension? How did I not notice that?
In Figure 2, an air source amplifier is added; this amplifier is controlled by a solenoid valve, allowing the main air supply pipe to quickly enter the cylinder or for the gas inside the cylinder to be rapidly expelled, thereby speeding up the valve’s response time. 26 is a Y-type drain valve, used to check for blockages in the air supply pipe. Look at the English notes.
26 A CHECK VALVE refers to a one-way valve/reverse flow valve.